58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
/*
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Copyright (c) 2013 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include <algorithm>
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#include "abstract.h"
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#include "free_vars.h"
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#include "replace.h"
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namespace lean {
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expr abstract(expr const & e, unsigned n, expr const * s) {
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lean_assert(std::all_of(s, s+n, closed));
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auto f = [=](expr const & e, unsigned offset) -> expr {
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unsigned i = n;
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while (i > 0) {
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--i;
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if (s[i] == e)
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return mk_var(offset + n - i - 1);
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}
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return e;
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};
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return replace_fn<decltype(f)>(f)(e);
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}
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expr abstract_p(expr const & e, unsigned n, expr const * s) {
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lean_assert(std::all_of(s, s+n, closed));
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auto f = [=](expr const & e, unsigned offset) -> expr {
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unsigned i = n;
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while (i > 0) {
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--i;
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if (is_eqp(s[i], e))
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return mk_var(offset + n - i - 1);
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}
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return e;
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};
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return replace_fn<decltype(f)>(f)(e);
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}
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#define MkBinder(FName) \
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expr FName(std::initializer_list<std::pair<expr const &, expr const &>> const & l, expr const & b) { \
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expr r = b; \
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auto it = l.end(); \
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while (it != l.begin()) { \
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--it; \
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auto const & p = *it; \
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r = FName(p.first, p.second, r); \
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} \
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return r; \
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}
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MkBinder(Fun);
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MkBinder(Pi);
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MkBinder(Let);
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}
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